Programmable constant temperature and humidity testing machine

The utility model relates to a programmable constant-temperature and constant-humidity testing machine, in particular to an energy-saving programmable constant-temperature and constant-humidity testing box. A programmable constant-temperature and constant-humidity testing machine comprises a box body (1) and a box door (2), a testing box (3), an evaporation chamber (4), a humidification chamber (5) and a freezing chamber (6) are sequentially arranged in the box body (1) from left to right, and the programmable constant-temperature and constant-humidity testing machine is characterized in that an air inlet (31) is formed in the bottom of the testing box (3), the testing box (3) is covered with a constant-temperature layer (7), and the constant-temperature layer (7) is covered with a heat preservation layer (8); and a first air exhaust louver (1101) and a second air exhaust louver (1102) are respectively arranged on the isothermal layer (7) and the test box (3) right below the air outlet (9). By adopting the st